Serial stowaway Marilyn Hartman was arrested last week after she illegally boarded a London-bound plane.

A fraudulent frequent flyer was arrested again last week after she sneaked past security at Chicago's O'Hare International Airport and illegally boarded a London-bound plane.

Serial stowaway Marilyn Hartman, 66, who has a history of flying without a passport or boarding pass, made it overseas before authorities realized she had taken the flight without credentials.

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Hartman was flown back to Chicago Thursday night, where she was arrested upon her arrival.

She is charged with felony theft and a misdemeanor count of criminal trespassing.

Chicago Police spokesman Anthony Guglielmi told CBS Chicago that Hartman slipped through a TSA checkpoint before taking a shuttle to an international terminal. She boarded a British Airways flight the following day.

Hartman had reportedly wandered around Chicago O'Hare for two days without being questioned.

Once on the London-bound plane, she hid in a bathroom before snagging an empty seat, CBS Chicago reported.

Marilyn Hartman, who has a history of sneaking aboard planes, slipped past security at Chicago's O'Hare International Airport this week and flew to London. (Chicago Police Department via AP)

She was sent back to O'Hare when she couldn't produce a passport Monday at Heathrow Airport.

Hartman has a history of sneaking onto planes at O'Hare and Chicago Midway International Airport.

She was arrested twice in two days in July 2015 for attempting to sneak through airports without a valid ticket.

Prior to Thursday, she had been arrested six times in airplane-related incidents, most recently in February 2016.

In 2016, she was sentenced to six months of house arrest and placed on two years of mental health probation.

She has said homelessness drove her to take "desperate measures" and she feels safer in airports than in the streets.